Improvement in supports for stools



6.1. WUDWAHD.

Support for Stools.

N0. 159,243 Patented Jan.26,1875.

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WITNESSES HJVENTOR 92M. @A1-f2. mi M By /dtormeys CHARLES J. WOODVVARD,OF BROOKLYN, YORK.

IMPROVEMENT IN SUPPORTS FOR STOOLS.

Specification forming part of Letters Patent No. 159,243, dated January26, 1875; application tiled July 16, 1874.

Toull` 'whom it may concern Be it known that I, GHARLns. J. Woond WARD",of the city of Brooklyn and county of Kings, in the State of New York,have invented a new and useful Improvement in Supports' for Stools, &c.,of which the following is a specification:

This invention relates, primarily, to means for supporting at any heightthe seat of an adjustable stool, and for quickly raising and loweringtheseat at will without turning the latter. Y

The invention consists in the employment or use -of a quick or long-pitch screw, loose in its bearings, with a friction-brake of anysuitable form, to prevent the screw from turning. When the screw :islocked it securely supports the seat or other object, and when releasedfrom retention by the brake it rotates freely,

and permits the seat or other object to be' raised or lowered to anyrequired extent.

The invention consists, further, in alifting treadle, to engage with thelower end or spindle ofthe screw, as means for releasing it, the brakebeing formed by a collar on the screw, in combination with a xed cushionbeneath the same. 'p

Figure l is partly an elevation and partly a vertical section otl amusic-stoel, illustrating` this invention. Fig. 2 is a longitudinalsection of the sliding stem, detached. Figu is an end view of the same.

The drawing represents a stool which embodies ali the features of thisinvention in a preferred form.

The stool consists ot a base, A, of ornamental shape, terminating at topin a hollow standard, c, with a seat, B, having attached 'to its lowerside by screws a stem, b, which is adapted to slide within the hollowstandard c ot' the base A'. The standard a and stem I) form together ahollow telescopic standard,

.which is square in cross-section, so as to prevent the vseat B fromturning. lVithin this telescopic standard a quick or long-pitch screw,G, is arranged, the same having a eylindrical spindle, c, at its lowerend, which occupies a bearing, d, in the base A, and terminates in aconical point, c, and is provided with a transverse pin, f, to preventits accidental displacement. The bit or threaded poring for saidbrake-disk la. A treadle-lever, D,

is pivoted between lugs j' within the base A, and constructed with ahorizontal disk, It', to form a step for the spindle c c ot' the screwO. rlhe other end, l,- of the lever is turned upward, and projectsthrough au aperture,-m, in the top of the base.

By pressing on this projecting point with lthe foot the screw C islit'ted, so as to disengage its brakedisk h from the cushion t', and atthe same time a frictionless stepbearing is formed bythe disk k ofthelever l), in connection with the conical point c of the-screw-spindle.The screw is thus rendered free to turn, and permits a free elevation ordepression of the seat B. When the foot is removed from the treadle thescrew drops instantly, and is simultaneously locked by its brake, andsecurely supports the seat at the point to which it was adjusted.

In this illustration a single screw is employed; but one may be appliedto each leg or lcorner ot' a chair or table, for instance, in

which latter case the standards would not require to be square orangular, but might be round in cross-section, as the multiplication ot'.the points of support would prevent the seat or corresponding objectfrom rotating.

Another proposed modification consists of a spur or positive brake orclutch, in lieu of the described friction-brake, as means for lock ingthe screw.

The seat of a stool embodying this invention could be swiveled to itsstem, so as to rotate independently, without detriment; but an importantadvantage ot' this invention is the obviation ot' any necessity forleaving or turning the seat in order to adjust it.

Another advantage consists in the facility it atfords for applyingadjusting-screws to multiple supports.

Another advantage over the ordinaryr adjusting-screws consists in therapidity of the adjusting movements.

The base A of the illustrative stool may be cast-iron or wooden. Theseat B may be `of wood, upholstered in any approved style. The stem ZJ,screw C, and lever D may be, preferably, cast of iron and malleableized;or the screw may be of steel.

. The primary subject-matter of this invention is designed for generalapplication as new means for supporting' at any height the seats or topsof stools, chairs, or tables, or windowsash, or other objects whichrequire to be adjustable as to height.

The following is claimed as new, namely:

,ll A quick or long-pitch screw, C, loose in its bearings, incombination with a non-rotary screw C, havin g the step-spindle c e andbrake disk h the cushion t', and the treadle-lever D, having thestep-disk k and projecting end l, substantially as specified, toconstitute an improved adjustable stool. y

GHAS. JAS. WOODWARD.

' Witnesses:

H. A, BoWDoIN, J om: JAS. HoWEs.

